apfstests/common/xfs

#
# XFS specific common functions.
#

_setup_large_xfs_fs()
{
	fs_size=$1
	local tmp_dir=/tmp/

	[ "$LARGE_SCRATCH_DEV" != yes ] && return 0
	[ -z "$SCRATCH_DEV_EMPTY_SPACE" ] && SCRATCH_DEV_EMPTY_SPACE=0
	[ $SCRATCH_DEV_EMPTY_SPACE -ge $fs_size ] && return 0

	# calculate the size of the file we need to allocate.
	# Default free space in the FS is 50GB, but you can specify more via
	# SCRATCH_DEV_EMPTY_SPACE
	file_size=$(($fs_size - 50*1024*1024*1024))
	file_size=$(($file_size - $SCRATCH_DEV_EMPTY_SPACE))

	# mount the filesystem, create the file, unmount it
	_try_scratch_mount 2>&1 >$tmp_dir/mnt.err
	local status=$?
	if [ $status -ne 0 ]; then
		echo "mount failed"
		cat $tmp_dir/mnt.err >&2
		rm -f $tmp_dir/mnt.err
		return $status
	fi
	rm -f $tmp_dir/mnt.err

	xfs_io -F -f \
		-c "truncate $file_size" \
		-c "falloc -k 0 $file_size" \
		-c "chattr +d" \
		$SCRATCH_MNT/.use_space 2>&1 > /dev/null
	export NUM_SPACE_FILES=1
	status=$?
	_scratch_unmount
	if [ $status -ne 0 ]; then
		echo "large file prealloc failed"
		cat $tmp_dir/mnt.err >&2
		return $status
	fi
	return 0
}

_scratch_mkfs_xfs_opts()
{
	mkfs_opts=$*

	# remove metadata related mkfs options if mkfs.xfs doesn't them
	if [ -n "$XFS_MKFS_HAS_NO_META_SUPPORT" ]; then
		mkfs_opts=`echo $mkfs_opts | sed "s/-m\s\+\S\+//g"`
	fi

	_scratch_options mkfs

	echo "$MKFS_XFS_PROG $SCRATCH_OPTIONS $mkfs_opts"
}


_scratch_mkfs_xfs_supported()
{
	local mkfs_opts=$*

	_scratch_options mkfs

	$MKFS_XFS_PROG -N $MKFS_OPTIONS $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
	local mkfs_status=$?

	# a mkfs failure may be caused by conflicts between $MKFS_OPTIONS and
	# $mkfs_opts, try again without $MKFS_OPTIONS
	if [ $mkfs_status -ne 0 -a -n "$mkfs_opts" ]; then
		$MKFS_XFS_PROG -N $SCRATCH_OPTIONS $mkfs_opts $SCRATCH_DEV
		mkfs_status=$?
	fi
	return $mkfs_status
}

_scratch_mkfs_xfs()
{
	local mkfs_cmd="`_scratch_mkfs_xfs_opts`"
	local mkfs_filter="sed -e '/less than device physical sector/d' \
			       -e '/switching to logical sector/d' \
			       -e '/Default configuration/d'"
	local tmp=`mktemp -u`
	local mkfs_status

	_scratch_do_mkfs "$mkfs_cmd" "$mkfs_filter" $* 2>$tmp.mkfserr 1>$tmp.mkfsstd
	mkfs_status=$?


	if [ $mkfs_status -eq 0 -a "$LARGE_SCRATCH_DEV" = yes ]; then
		# manually parse the mkfs output to get the fs size in bytes
		local fs_size
		fs_size=`cat $tmp.mkfsstd | perl -ne '
			if (/^data\s+=\s+bsize=(\d+)\s+blocks=(\d+)/) {
				my $size = $1 * $2;
				print STDOUT "$size\n";
			}'`
		_setup_large_xfs_fs $fs_size
		mkfs_status=$?
	fi

	# output mkfs stdout and stderr
	cat $tmp.mkfsstd
	cat $tmp.mkfserr >&2
	rm -f $tmp.mkfserr $tmp.mkfsstd

	return $mkfs_status
}

# xfs_check script is planned to be deprecated. But, we want to
# be able to invoke "xfs_check" behavior in xfstests in order to
# maintain the current verification levels.
_xfs_check()
{
	OPTS=" "
	DBOPTS=" "
	USAGE="Usage: xfs_check [-fsvV] [-l logdev] [-i ino]... [-b bno]... special"

	OPTIND=1
	while getopts "b:fi:l:stvV" c; do
		case $c in
			s) OPTS=$OPTS"-s ";;
			t) OPTS=$OPTS"-t ";;
			v) OPTS=$OPTS"-v ";;
			i) OPTS=$OPTS"-i "$OPTARG" ";;
			b) OPTS=$OPTS"-b "$OPTARG" ";;
			f) DBOPTS=$DBOPTS" -f";;
			l) DBOPTS=$DBOPTS" -l "$OPTARG" ";;
			V) $XFS_DB_PROG -p xfs_check -V
			   return $?
			   ;;
		esac
	done
	set -- extra $@
	shift $OPTIND
	case $# in
		1) ${XFS_DB_PROG}${DBOPTS} -F -i -p xfs_check -c "check$OPTS" $1
		   status=$?
		   ;;
		2) echo $USAGE 1>&1
		   status=2
		   ;;
	esac
	return $status
}

_scratch_xfs_db_options()
{
	SCRATCH_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
	echo $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_scratch_xfs_db()
{
	$XFS_DB_PROG "$@" $(_scratch_xfs_db_options)
}

_scratch_xfs_logprint()
{
	SCRATCH_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
	$XFS_LOGPRINT_PROG $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_test_xfs_logprint()
{
	TEST_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$TEST_LOGDEV" ] && \
		TEST_OPTIONS="-l$TEST_LOGDEV"
	$XFS_LOGPRINT_PROG $TEST_OPTIONS $* $TEST_DEV
}

_scratch_xfs_check()
{
	SCRATCH_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		SCRATCH_OPTIONS="-l $SCRATCH_LOGDEV"
	[ "$LARGE_SCRATCH_DEV" = yes ] && \
		SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -t"
	_xfs_check $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

_scratch_xfs_repair()
{
	SCRATCH_OPTIONS=""
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_LOGDEV" ] && \
		SCRATCH_OPTIONS="-l$SCRATCH_LOGDEV"
	[ "$USE_EXTERNAL" = yes -a ! -z "$SCRATCH_RTDEV" ] && \
		SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -r$SCRATCH_RTDEV"
	[ "$LARGE_SCRATCH_DEV" = yes ] && SCRATCH_OPTIONS=$SCRATCH_OPTIONS" -t"
	$XFS_REPAIR_PROG $SCRATCH_OPTIONS $* $SCRATCH_DEV
}

# this test requires the projid32bit feature to be available in mkfs.xfs.
#
_require_projid32bit()
{
       _scratch_mkfs_xfs_supported -i projid32bit=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have projid32bit feature"
}

_require_projid16bit()
{
	_scratch_mkfs_xfs_supported -i projid32bit=0 >/dev/null 2>&1 \
	   || _notrun "16 bit project IDs not supported on $SCRATCH_DEV"
}

# this test requires the crc feature to be available in mkfs.xfs
#
_require_xfs_mkfs_crc()
{
	_scratch_mkfs_xfs_supported -m crc=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have crc feature"
}

# this test requires the xfs kernel support crc feature
#
_require_xfs_crc()
{
	_scratch_mkfs_xfs -m crc=1 >/dev/null 2>&1
	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc feature"
	_scratch_unmount
}

# this test requires the xfs kernel support crc feature on scratch device
#
_require_scratch_xfs_crc()
{
	_scratch_mkfs_xfs >/dev/null 2>&1
	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support crc feature"
	xfs_info $SCRATCH_MNT | grep -q 'crc=1' || _notrun "crc feature not supported by this filesystem"
	_scratch_unmount
}

# this test requires the finobt feature to be available in mkfs.xfs
#
_require_xfs_mkfs_finobt()
{
	_scratch_mkfs_xfs_supported -m crc=1,finobt=1 >/dev/null 2>&1 \
	   || _notrun "mkfs.xfs doesn't have finobt feature"
}

# this test requires the xfs kernel support finobt feature
#
_require_xfs_finobt()
{
	_scratch_mkfs_xfs -m crc=1,finobt=1 >/dev/null 2>&1
	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support finobt feature"
	_scratch_unmount
}

# this test requires xfs sysfs attribute support
#
_require_xfs_sysfs()
{
	attr=$1
	sysfsdir=/sys/fs/xfs

	if [ ! -e $sysfsdir ]; then
		_notrun "no kernel support for XFS sysfs attributes"
	fi

	if [ ! -z $1 ] && [ ! -e $sysfsdir/$attr ]; then
		_notrun "sysfs attribute '$attr' is not supported"
	fi
}

# this test requires the xfs sparse inode feature
#
_require_xfs_sparse_inodes()
{
	_scratch_mkfs_xfs_supported -m crc=1 -i sparse > /dev/null 2>&1 \
		|| _notrun "mkfs.xfs does not support sparse inodes"
	_scratch_mkfs_xfs -m crc=1 -i sparse > /dev/null 2>&1
	_try_scratch_mount >/dev/null 2>&1 \
		|| _notrun "kernel does not support sparse inodes"
	_scratch_unmount
}

# check that xfs_db supports a specific command
_require_xfs_db_command()
{
	if [ $# -ne 1 ]; then
		echo "Usage: _require_xfs_db_command command" 1>&2
		exit 1
	fi
	command=$1

	_scratch_xfs_db -x -c "help" | grep $command > /dev/null || \
		_notrun "xfs_db $command support is missing"
}

# Does the filesystem mounted from a particular device support scrub?
_supports_xfs_scrub()
{
	local mountpoint="$1"
	local device="$2"

	if [ ! -b "$device" ] || [ ! -e "$mountpoint" ]; then
		echo "Usage: _supports_xfs_scrub mountpoint device"
		exit 1
	fi

	test "$FSTYP" = "xfs" || return 1
	test -x "$XFS_SCRUB_PROG" || return 1

	# Probe for kernel support...
	$XFS_IO_PROG -c 'help scrub' 2>&1 | grep -q 'types are:.*probe' || return 1
	$XFS_IO_PROG -c "scrub probe" "$mountpoint" 2>&1 | grep -q "Inappropriate ioctl" && return 1

	# Scrub can't run on norecovery mounts
	_fs_options "$device" | grep -q "norecovery" && return 1

	return 0
}

# run xfs_check and friends on a FS.
_check_xfs_filesystem()
{
	if [ $# -ne 3 ]; then
		echo "Usage: _check_xfs_filesystem device <logdev>|none <rtdev>|none" 1>&2
		exit 1
	fi

	extra_mount_options=""
	extra_log_options=""
	extra_options=""
	device=$1
	if [ -f $device ]; then
		extra_options="-f"
	fi

	if [ "$2" != "none" ]; then
		extra_log_options="-l$2"
		extra_mount_options="-ologdev=$2"
	fi

	if [ "$3" != "none" ]; then
		extra_rt_options="-r$3"
		extra_mount_options=$extra_mount_options" -ortdev=$3"
	fi
	extra_mount_options=$extra_mount_options" $MOUNT_OPTIONS"

	[ "$FSTYP" != xfs ] && return 0

	type=`_fs_type $device`
	ok=1

	# Run online scrub if we can.
	mntpt="$(_is_dev_mounted $device)"
	if [ -n "$mntpt" ] && _supports_xfs_scrub "$mntpt" "$device"; then
		"$XFS_SCRUB_PROG" $scrubflag -v -d -n $device > $tmp.scrub 2>&1
		if [ $? -ne 0 ]; then
			_log_err "_check_xfs_filesystem: filesystem on $device failed scrub"
			echo "*** xfs_scrub $scrubflag -v -d -n output ***" >> $seqres.full
			cat $tmp.scrub >> $seqres.full
			echo "*** end xfs_scrub output" >> $serqres.full
			ok=0
		fi
		rm -f $tmp.scrub
	fi

	if [ "$type" = "xfs" ]; then
		# mounted ...
		mountpoint=`_umount_or_remount_ro $device`
	fi

	$XFS_LOGPRINT_PROG -t $extra_log_options $device 2>&1 \
		| tee $tmp.logprint | grep -q "<CLEAN>"
	if [ $? -ne 0 -a "$HOSTOS" = "Linux" ]; then
		_log_err "_check_xfs_filesystem: filesystem on $device has dirty log"
		echo "*** xfs_logprint -t output ***"	>>$seqres.full
		cat $tmp.logprint			>>$seqres.full
		echo "*** end xfs_logprint output"	>>$seqres.full

		ok=0
	fi

	# xfs_check runs out of memory on large files, so even providing the test
	# option (-t) to avoid indexing the free space trees doesn't make it pass on
	# large filesystems. Avoid it.
	if [ "$LARGE_SCRATCH_DEV" != yes ]; then
		_xfs_check $extra_log_options $device 2>&1 |\
			_fix_malloc >$tmp.fs_check
	fi
	if [ -s $tmp.fs_check ]; then
		_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (c)"
		echo "*** xfs_check output ***"		>>$seqres.full
		cat $tmp.fs_check			>>$seqres.full
		echo "*** end xfs_check output"		>>$seqres.full

		ok=0
	fi

	$XFS_REPAIR_PROG -n $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
	if [ $? -ne 0 ]; then
		_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (r)"
		echo "*** xfs_repair -n output ***"	>>$seqres.full
		cat $tmp.repair | _fix_malloc		>>$seqres.full
		echo "*** end xfs_repair output"	>>$seqres.full

		ok=0
	fi
	rm -f $tmp.fs_check $tmp.logprint $tmp.repair

	# Optionally test the index rebuilding behavior.
	if [ -n "$TEST_XFS_REPAIR_REBUILD" ]; then
		$XFS_REPAIR_PROG $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
		if [ $? -ne 0 ]; then
			_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild)"
			echo "*** xfs_repair output ***"	>>$seqres.full
			cat $tmp.repair | _fix_malloc		>>$seqres.full
			echo "*** end xfs_repair output"	>>$seqres.full

			ok=0
		fi
		rm -f $tmp.repair

		$XFS_REPAIR_PROG -n $extra_options $extra_log_options $extra_rt_options $device >$tmp.repair 2>&1
		if [ $? -ne 0 ]; then
			_log_err "_check_xfs_filesystem: filesystem on $device is inconsistent (rebuild-reverify)"
			echo "*** xfs_repair -n output ***"	>>$seqres.full
			cat $tmp.repair | _fix_malloc		>>$seqres.full
			echo "*** end xfs_repair output"	>>$seqres.full

			ok=0
		fi
		rm -f $tmp.repair
	fi

	if [ $ok -eq 0 ]; then
		echo "*** mount output ***"		>>$seqres.full
		_mount					>>$seqres.full
		echo "*** end mount output"		>>$seqres.full
	elif [ "$type" = "xfs" ]; then
		_mount_or_remount_rw "$extra_mount_options" $device $mountpoint
	fi

	if [ $ok -eq 0 ]; then
		status=1
		if [ "$iam" != "check" ]; then
			exit 1
		fi
		return 1
	fi

	return 0
}

_check_xfs_test_fs()
{
	TEST_LOG="none"
	TEST_RT="none"
	[ "$USE_EXTERNAL" = yes -a ! -z "$TEST_LOGDEV" ] && \
		TEST_LOG="$TEST_LOGDEV"

	[ "$USE_EXTERNAL" = yes -a ! -z "$TEST_RTDEV" ] && \
		TEST_RT="$TEST_RTDEV"

	_check_xfs_filesystem $TEST_DEV $TEST_LOG $TEST_RT
	return $?
}

_require_xfs_test_rmapbt()
{
	_require_test

	if [ "$(xfs_info "$TEST_DIR" | grep -c "rmapbt=1")" -ne 1 ]; then
		_notrun "rmapbt not supported by test filesystem type: $FSTYP"
	fi
}

_require_xfs_scratch_rmapbt()
{
	_require_scratch

	_scratch_mkfs > /dev/null
	_scratch_mount
	if [ "$(xfs_info "$SCRATCH_MNT" | grep -c "rmapbt=1")" -ne 1 ]; then
		_scratch_unmount
		_notrun "rmapbt not supported by scratch filesystem type: $FSTYP"
	fi
	_scratch_unmount
}

_xfs_bmapx_find()
{
	case "$1" in
	"attr")
		param="a"
		;;
	"cow")
		param="c"
		;;
	*)
		param="e"
		;;
	esac
	shift
	file="$1"
	shift

	$XFS_IO_PROG -c "bmap -${param}lpv" "$file" | grep -c "$@"
}

# Reset all xfs error handling attributes, set them to original
# status.
#
# Only one argument, and it's mandatory:
#  - dev: device name, e.g. $SCRATCH_DEV
#
# Note: this function only works for XFS
_reset_xfs_sysfs_error_handling()
{
	local dev=$1

	if [ ! -b "$dev" -o "$FSTYP" != "xfs" ]; then
		_fail "Usage: reset_xfs_sysfs_error_handling <device>"
	fi

	_set_fs_sysfs_attr $dev error/fail_at_unmount 1
	echo -n "error/fail_at_unmount="
	_get_fs_sysfs_attr $dev error/fail_at_unmount

	# Make sure all will be configured to retry forever by default, except
	# for ENODEV, which is an unrecoverable error, so it will be configured
	# to not retry on error by default.
	for e in default EIO ENOSPC; do
		_set_fs_sysfs_attr $dev \
				   error/metadata/${e}/max_retries -1
		echo -n "error/metadata/${e}/max_retries="
		_get_fs_sysfs_attr $dev error/metadata/${e}/max_retries

		_set_fs_sysfs_attr $dev \
				   error/metadata/${e}/retry_timeout_seconds 0
		echo -n "error/metadata/${e}/retry_timeout_seconds="
		_get_fs_sysfs_attr $dev \
				   error/metadata/${e}/retry_timeout_seconds
	done
}

# Skip if we are running an older binary without the stricter input checks.
# Make multiple checks to be sure that there is no regression on the one
# selected feature check, which would skew the result.
#
# At first, make a common function that runs the tests and returns
# number of failed cases.
_xfs_mkfs_validation_check()
{
	local tmpfile=`mktemp`
	local cmd="$MKFS_XFS_PROG -f -N -d file,name=$tmpfile,size=1g"

	$cmd -s size=8s >/dev/null 2>&1
	local sum=$?

	$cmd -l version=2,su=260k >/dev/null 2>&1
	sum=`expr $sum + $?`

	rm -f $tmpfile
	return $sum
}

# Skip the test if all calls passed - mkfs accepts invalid input
_require_xfs_mkfs_validation()
{
	_xfs_mkfs_validation_check
	if [ "$?" -eq 0 ]; then
		_notrun "Requires newer mkfs with stricter input checks: the oldest supported version of xfsprogs is 4.7."
	fi
}

# The opposite of _require_xfs_mkfs_validation.
_require_xfs_mkfs_without_validation()
{
	_xfs_mkfs_validation_check
	if [ "$?" -ne 0 ]; then
		_notrun "Requires older mkfs without strict input checks: the last supported version of xfsprogs is 4.5."
	fi
}

# XFS ability to change UUIDs on V5/CRC filesystems
#
_require_meta_uuid()
{
	# This will create a crc fs on $SCRATCH_DEV
	_require_xfs_crc

	_scratch_xfs_db -x -c "uuid restore" 2>&1 \
	   | grep -q "invalid UUID\|supported on V5 fs" \
	   && _notrun "Userspace doesn't support meta_uuid feature"

	_scratch_xfs_db -x -c "uuid generate" >/dev/null 2>&1

	_try_scratch_mount >/dev/null 2>&1 \
	   || _notrun "Kernel doesn't support meta_uuid feature"
	_scratch_unmount
}

# this test requires mkfs.xfs have case-insensitive naming support
_require_xfs_mkfs_ciname()
{
	_scratch_mkfs_xfs_supported -n version=ci >/dev/null 2>&1 \
		|| _notrun "need case-insensitive naming support in mkfs.xfs"
}

# XFS_DEBUG requirements
_require_xfs_debug()
{
	if grep -q "debug 0" /proc/fs/xfs/stat; then
		_notrun "Require XFS built with CONFIG_XFS_DEBUG"
	fi
}
_require_no_xfs_debug()
{
	if grep -q "debug 1" /proc/fs/xfs/stat; then
		_notrun "Require XFS built without CONFIG_XFS_DEBUG"
	fi
}

# Require that assertions will not crash the system.
#
# Assertions would always crash the system if XFS assert fatal was enabled
# (CONFIG_XFS_ASSERT_FATAL=y).  If a test is designed to trigger an assertion,
# skip the test on a CONFIG_XFS_ASSERT_FATAL built XFS by default.  Note:
# CONFIG_XFS_ASSERT_FATAL can be disabled by setting bug_on_assert to zero if
# we want test to run.
_require_no_xfs_bug_on_assert()
{
	if [ -f /sys/fs/xfs/debug/bug_on_assert ]; then
		grep -q "1" /sys/fs/xfs/debug/bug_on_assert && \
		   _notrun "test requires XFS bug_on_assert to be off, turn it off to run the test"
	else
		# Note: Prior to the creation of CONFIG_XFS_ASSERT_FATAL (and
		# the sysfs knob bug_on_assert), assertions would always crash
		# the system if XFS debug was enabled (CONFIG_XFS_DEBUG=y).  If
		# a test is designed to trigger an assertion and the test
		# designer does not want to hang fstests, skip the test.
		_require_no_xfs_debug
	fi
}

# Get a metadata field
# The first arg is the field name
# The rest of the arguments are xfs_db commands to find the metadata.
_scratch_xfs_get_metadata_field()
{
	local key="$1"
	shift

	local grep_key="$(echo "${key}" | tr '[]()' '....')"
	local cmds=()
	local arg
	for arg in "$@"; do
		cmds+=("-c" "${arg}")
	done
	_scratch_xfs_db "${cmds[@]}" -c "print ${key}" | grep "^${grep_key}" | \
		sed -e 's/^.* = //g'
}

# Set a metadata field
# The first arg is the field name
# The second arg is the new value
# The rest of the arguments are xfs_db commands to find the metadata.
_scratch_xfs_set_metadata_field()
{
	local key="$1"
	local value="$2"
	shift; shift

	local cmds=()
	local arg
	for arg in "$@"; do
		cmds+=("-c" "${arg}")
	done

	local wr_cmd="write"
	_scratch_xfs_db -x -c "help write" | egrep -q "(-c|-d)" && value="-- ${value}"
	_scratch_xfs_db -x -c "help write" | egrep -q "(-d)" && wr_cmd="${wr_cmd} -d"
	_scratch_xfs_db -x "${cmds[@]}" -c "${wr_cmd} ${key} ${value}"
}

_scratch_xfs_get_sb_field()
{
	_scratch_xfs_get_metadata_field "$1" "sb 0"
}

_scratch_xfs_set_sb_field()
{
	_scratch_xfs_set_metadata_field "$1" "$2" "sb 0"
}